GetUILanguageList should correctly handle locale aliases.

GetUILanguageList didn't check for locale aliases when resolving input
method languages. This patch fixes it.

BUG=418220
TEST=manual

Review URL: https://codereview.chromium.org/608903003

Cr-Commit-Position: refs/heads/master@{#297086}

chrome/browser/ui/webui/chromeos/login/l10n_util.cc

@@ -167,7 +167,18 @@ scoped_ptr<base::ListValue> GetLanguageList(
     if (std::find(base_language_codes.begin(),
                   base_language_codes.end(),
                   *it) == base_language_codes.end()) {
-      continue;
+      // Try to translate language code and look up again.
+      std::string resolved_locale;
+
+      if (!l10n_util::CheckAndResolveLocale(*it, &resolved_locale))
+        continue;
+
+      if (std::find(base_language_codes.begin(),
+                    base_language_codes.end(),
+                    resolved_locale) == base_language_codes.end()) {
+        continue;
+      }
+      // Translated language was successfully found.
     }
 
     const base::string16 display_name =